Chld, Call Related Supplementary Services Command - Fibocom G510 User Manual

(... call waiting indication received by the Module ...)
+CCWA: "+358317654321",145,1,"Bob"
AT+CHLD=0
OK
NO CARRIER
AT+CRC=1
OK
(...waiting call..., caller restricted to its CLI presentation (used AT+CLIR)...)
+CCWA: "",128,1,"",1

5.1.11 +CHLD, Call Related Supplementary Services Command

This command controls the Call Hold and Multiparty Conversation services. This command manipulates
voice calls only. The Set command allows the control of the following call related services:
Call HOLD: A call can be temporarily disconnected from the Module, but the connection is retained by

the network.
 MTPY (Multi party) Conversation: Conference calls.
The network does not reserve more than one traffic channel for a mobile station; therefore the Module can
have only one call on hold at a time.
Note: Only voice calls can be put on HOLD.
A precondition for the multi-party service is that the Module is in control of one active call and one call on
hold. In this situation, the Module can request the network to begin the MTPY (Multi Party) service. Once
a MTPY call is active, remote parties may be added, disconnected or separated (removed from the MTPY
call, but remain connected to the served mobile subscriber).The maximum number of remote parties is
5.In this command, the term CALL refers to a single or MTPY call.
A single Active call is considered a MTPY call with one call index numbered as 1.
Command
+CHLD=<n>
G5/G6-Family AT Commands User Manual
//Release the waiting call
//RING indication is not relevant to CCWA indication
//CLI is restricted, but call type recognized as voice
Response/Action
If the call is terminated:
NO CARRIER
OK (approve request was submitted)
If the call state is changed (link, split, from active to hold, and so on):
OK (approve request was done)
If the call is terminated and another call is answered:
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